CMOS FULLY-DIFFERENTIAL BANDPASS SIGMA-DELTA MODULATOR USING SWITCHED-CURRENT CIRCUITS

Authors
DELAROSA JM VERDU BP MEDEIRO F VAZQUEZ AR
Citation
Jm. Delarosa et al., CMOS FULLY-DIFFERENTIAL BANDPASS SIGMA-DELTA MODULATOR USING SWITCHED-CURRENT CIRCUITS, Electronics Letters, 32(3), 1996, pp. 156-157
Citations number
8
Categorie Soggetti
Engineering, Eletrical & Electronic
Journal title
Electronics Letters → ACNP
ISSN journal
00135194
Volume
32
Issue
3
Year of publication
1996
Pages
156 - 157
Database
ISI
SICI code
0013-5194(1996)32:3<156:CFBSMU>2.0.ZU;2-N
Abstract
The authors present a fourth-order bandpass Sigma Delta switched-curre nt modulator IC in 0.8 mu m CMOS single-poly technology. It is the fir st reported integrated circuit realisation of a bandpass Sigma Delta m odulator using switched-current circuits. Its architecture is obtained by applying a lowpass to bandpass transformation (z(-1) --> - z(-2)) to a second-order lowpass modulator. It has been realised using fully- differential circuitry with common-mode feedback. Measurements show 8 bit dynamic range up to 5MHz clock frequency.